Meet Our Team

The entire staff at Dr. Potesta-Knoll's state-of-the-art dental and prosthodontic practice in San Francisco's Marina neighborhood, share a commitment to providing professional, conscientious and friendly service. From the minute patients walk in, through the treatment and cleanings they receive, to booking follow-up appointments on the way out, the blue-chip team aims to please. Each staff member is dedicated to offering the highest level of patient care and services possible.

The administrative team facilitates scheduling and is knowledgeable about dental insurance policies, while the highly-experienced and fully certified staff of dental assistants and hygienists are dedicated to ensuring treatment is safe and comfortable. The entire staff adheres to the strictest protocols of infection control and sterilization, and the dental team are all CPR certified.

In addition, the team is multilingual and willing to communicate with patients in their native language. Those spoken here are English and Spanish.

  • Stephanie Zaczek

    Stephanie has been serving patients as a certified hygienist at Dr. Fiorella Potesta-Knoll’s San Francisco dental practice for 17 years. She believes an integral component to helping our patients achieve and maintain long-term oral health is being proactive with excellent oral hygiene education and care. Quality care and patient comfort are Stephanie’s top goals. She considers herself fortunate to be part of such a wonderful profession and enjoys working with Dr. Potesta-Knoll and all of her wonderful patients.

    Stephanie was born in London, England, and moved to San Francisco with her family when she was ten years old. She received her undergraduate degree in biochemistry from UC Berkeley. After UC Berkeley, Stephanie went on to UC San Francisco, where she received her dental education and graduate degree.

    When not practicing dental hygiene, Stephanie enjoys spending time with her family and friends. She and her husband have two children, Jennie a college student at UC Davis, and Nicholas who is in high school.

  • Michelle Hernandez Camus
    Registered Dental Hygienist​​​​​​​

    Michelle has over 32 years of experience working in the dental field. After completing her BA degree at Sonoma State University, she acquired her skills as a dental assistant and dental practice consultant while working at some of the best dental practices in the Bay Area. At Corinthian College, she served as the Dental Assistant Program Director and taught, as well as hired the entire staff of instructors for the program. As a result, she received an award for the “Best of the West Instructor of the Year”. She has also taught for the Dental Post Baccalaureate Program at San Francisco State University.

    Beneath Michelle’s friendly smile and warm personality lies a generous heart that cares deeply for all of her patients. She did her internship at the Global Health Outreach where she treated the native people in Ecuador and in the Amazon. She has volunteered her time to the International Humanitarian Dental-Medical Mission in Mexico where she treated the natives in the migrant farming camps and the children of migrant workers in three orphanages. She has also been part of a medical/dental clinical team at the City Team International Ministries in San Francisco, where she trains students to treat homeless individuals on the way to improve their dental hygiene.

    Michelle’s patients know that they are in good hands with her caring and skillful attention to detail.

    In her spare time, Michelle sings with the City Church Choir at Davies Symphony Hall every Easter Sunday and is also a member of the Beatles Choir where she sings to cheer hospice resident patients in Laguna Honda. She also enjoys playing golf, tennis, running, and gardening.

  • Susan Johns

    Susan, the office manager, has been working at the dental practice for over 20 years. She earned a bachelor’s degree in psychology from the University of Southern Maine. Susan loves the location of our dental office – with its amazing view of the San Francisco Bay and Golden Gate Bridges. She also enjoys working with a friendly, highly qualified team, an amazing dentist, and exceptional patients who have become family. Susan is a team player who helps wherever she can and strives to provide the best possible customer service and care.

    Susan grew up in the suburbs of Boston and now resides in Marin County with her husband and children. In her free time, she enjoys painting, skiing, hiking, camping, and exploring with her family.

  • Patty Santos
    Dental Assistant

    Patty has been working in dentistry for over 18 years and joined Dr. Potesta and team in January 2019.

    She feels blessed to be working in this office. She loves being part of the team and attending our wonderful patients.

    Patty most enjoys the social aspects of the job by getting to know the patients, making them feel comfortable before and during their treatment and overall providing outstanding customer service. She truly cares about the patients and the practice.

    Dr. Potesta and team are grateful to have Patty’s great attitude, talent, humor, patience, respect and kindness. They feel she is a big asset and are thankful she joined them.

  • Hannah Fjeldseth
    Schedule Coordinator/Assistant Manager

    Hannah grew up in Sacramento but recently moved to San Francisco and joined the practice in May 2019. She loves the great location of the office and being apart of a team that feels more like family. Hannah stays active in the office aiding patients in the front with any scheduling needs; as well as assisting in the back office whenever needed. Hannah knows the importance of health and fitness and enjoys staying active with working out, doing yoga and cooking. In her free time, she makes trips to Sacramento to visit her twin sister and her Australian Shepherd, Wiley.

  • Ligia Marcela Cubas
    Registered Dental Assistant

    I was born and raised in El Salvador. I graduated as a Doctor of Dental Surgery, in my country, In 2001.

    I moved to San Francisco In 2002 and have been working in the dental field ever since.

    In my free time I like to spend time with my husband and two children. I also like to work-out and cook.
    I am very proud to be part of a dental team whereby doctors and staff have as their main objective to
    provide comprehensive service to patients.

  • Kayleen Dobner, RDH
    Registered Dental Hygienist

    I was born and raised in California. I went to Cabrlllo College In Aptos, CA and received my RDH. I have a passion In always furthering my education.
    In my free time I enjoy playing volleyball, hiking, reading, and enjoying my friends and family.

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Our Regular Schedule


8:30 am-5:00 pm


8:30 am-5:00 pm


8:30 am-5:00 pm


8:30 am-5:00 pm